Add deployment pipeline, Dockerfile, Nomad spec and tests

- Dockerfile: python:3.12-slim + gunicorn, dynamic port, BUILD_VERSION args
- punktfri.nomad: Traefik routing for punktfri.i80.dk, host volume for SQLite
- .gitea/workflows/deploy.yml: build/push to Harbor, deploy to Nomad
- Makefile: install/run/test/build targets
- tests/test_app.py: 9 pytest tests covering all routes and validation
- requirements.txt: add gunicorn
- requirements-dev.txt: pytest
- app.py: health endpoint returns version/commit info

app.py

@@ -128,7 +128,11 @@ def admin():
 
 @app.route("/health")
 def health():
-    return {"status": "ok"}, 200
+    return {
+        "status": "ok",
+        "version": os.environ.get("BUILD_VERSION", "dev"),
+        "commit": os.environ.get("GIT_COMMIT", "unknown"),
+    }, 200
 
 
 init_db()